Finding the Fourth Proportional to 1,085.05, 1,497.56 and 642.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.05 : 1,497.56 = 642.93 : x
2. Step 2: Convert to fraction form
   1,085.05/1,497.56 = 642.93/x
3. Step 3: Cross multiply
   1,085.05x = 1,497.56 × 642.93
4. Step 4: Simplify right side
   1,085.05x = 962,826.25
5. Step 5: Solve for x
   x = 962,826.25/1,085.05
6. Step 6: Final answer
   x = 887.36